These micro-beads are 100% mineral and without chemical treatment. Perfect for naturally draining your plants and cleaning your pots, indoors and outdoors. Our marbles are only a mixture of gypsum and clay. -Clay → retains water and nutrients. - Calcium → strong roots. - Sulfur → better absorption of nutrients. Composition: - Calcium sulfate - Calcined clay. Intended Use Instructions: To spread on the soil surface or to pot your plant, add 2 parts growing medium (such as potting soil) to 1 part "Rooting" and water. Storage conditions: Store in a dry place, away from the ground and moisture. It is recommended to fold and reseal the packaging well after opening or partial use. Net quantity: 5.1 kg.